SAT Subject Biology Practice Question 144: Answer and Explanation

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Question: 144

14. Ecologists measured the evapotranspiration and net primary production of different ecosystem types. Their results are shown in the graph.

How much plant biomass is added to a square meter of temperate forest in one month?

A. 100 g
B. 500 g
C. 1,000 g
D. 1,200 g
E. 1,500 g

Correct Answer: A


The net primary production of temperate forest is approximately 1,200 grams per square meter per year. This is the amount of plant biomass added. The amount of biomass added in one month, or one-twelfth of this value, is 100 grams.

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